This is a simple addon that will show the file extension type and file size in the resource view page. There are no settings for the addon, just install it and forget it. What it looks like:

Description: Shows attachments by file size. This add-on allows the admin to quickly see which content has largest attachments (by file size). Clicking the content link will take you to the content so the admin can manage the attachment. For example the admin might like to convert large videos...

Adds file size and format on the "Download" button. For work, an installed is required.